[Bullfrog]

could you post a picture of what your looking at?

 

[Bullfrog]

i cant tell if thats the vaccum pump for the brake booster or near the thermostat housing.

 

[Bullfrog]

HOUSING. Thermostat. Incl's Thermostat.
Part Number: 05047861AA ; 05047772AB; 05047263AB; 05047263AC
This fits your 2013 Dodge Dart

but the sketch looks diffrent:

but googling part number:05047772AB found an ebay listing with pictures.

Looks like we found what your seeing. and because its a 2013 i wouldst be surprised if it was a left over part from something else and they moved the senor before fixing the casting.

 

[Bullfrog]

mid production design changes, using old wire loom parts. if you look at the part numbers they have a few rev B's in them so. could be legacy left over.

 

[Bullfrog]

I try...